An anonymous reader writes: Even since the current world’s tallest builing – the Burj Khalifa in Dubai – was completed, there has been a constant battle to build the world’s next tallest building. The current record holder stands tall at 828 meters and took five years to build, but a Chinese company called Broad Sustainable Building (BSB) aims to smash that record by building the 838 meter Sky City tower, in Changsa, China in a mere 90 days. BSB plans to use prefab building techniques to construct the tower in record time.

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